Hitachi Relion 670 Series Commissioning Manual page 196

Section 11
Testing functionality by secondary injection
• Check that activated trip signals and pickup signals are blocked by enabling BLKTR and BLKST.
• Check that all activated signals are disabled by BLOCK input.
• If required, perform creating faults on the remaining phases in the similar way.
Test of delayed fault clearing for three pole tripping
• Connect the test set for the injection of three phase voltages and currents to the appropriate
terminals of the IED.
• Enable the delayed fault clearance for three pole tripping by setting Del3phOp to TRUE (Enabled),
Del1PhOp to 3Ph (Disabled) and also set the inputs BLKDLFLT and FUSEFAIL to FALSE.
• Also assume circuit breaker is in closed position, that is, the input CBCLOSED is high prior to fault
occurrence.
• Create a BC fault such that their phase voltage magnitudes are lower than VPhSel< times
corresponding quadrature phase to phase voltage and set Tau to default value.
• Check that TRIP, TR_A, TR_B and TR_C are generated after the set delay time of t3Ph and ARST,
ARST3PH, ARST_A, ARST_B and ARST_C are also activated.
• Check that activated trip signals and pickup signals are blocked by enabling BLKTR and BLKST.
• Check that all activated signals are disabled by BLOCK input.
11.6.7.2 Completing the test
Continue to test another function or end the testing by setting the parameter TestMode to Disabled under:
Main menu /Tests /IED test mode /TESTMODE:1
Restore connections and settings to their original values if they were changed for testing purposes.
11.7 Frequency protection
11.7.1 Underfrequency protection SAPTUF (81)
Prepare the IED for verification of settings outlined in Section
11.7.1.1 Verifying the settings
Verification of PICKUP value and time delay to trip
1. Check that the IED settings are appropriate, for example the pickup value and the time delay.
2. Supply the IED with three-phase voltages at their rated values and initial frequency.
The initial frequency is calculated using Equation 101.
StartFrequency
IECEQUATION16059 V1 EN-US
3. Slowly decrease the voltage frequency bysteps of 40 mHz until the TRIP signal appears; during
each step apply the voltage signal for a time that is either at least 10% longer than (tDelay+100ms)
or a suitable time to monitor the function.
4. Note the frequency value at which the START signal appears and compare it with the set value
StartFrequency.
5. Note the frequency value at which the TRIP signal appears and compare it with the set value
StartFrequency.
6. Increase the frequency until its rated value is reached.
7. Check that the PICKUP signal resets.
190
   
0.02 floor f StartFrequency

r
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"Preparing the IED to verify
 
/ 0.04 0.04

1MRK506371-UUS Rev. M
GUID-4AFACF9B-9CA8-4960-9806-316FFCFEDEC0 v1
SEMOD53547-1 v1
M16289-2 v7
settings".
M16289-15 v3
M16289-17 v7
(Equation 101)
Line distance protection REL670
Commissioning manual